RecordSet.Open [英] RecordSet.Open

问题描述

大家好，
我正在使用代码将数据集转换为记录集，我想知道这行的错误是什么，我运行它后记录集仍然关闭，但是如果我在C#中进行了相同的代码，它将打开记录集. >

Hi all,
i''m using code to convert dataset to recordset and i want to know what is the error at this line, after i running it the recordset still closed, but if i make same code in c#, it open the recordset.

ADODB.Recordset.Open(Reflection.Missing.Value, Reflection.Missing.Value, ADODB.CursorTypeEnum.adOpenStatic,
                                ADODB.LockTypeEnum.adLockOptimistic, 0)

谢谢

Thanks

推荐答案

而不是MissingValue，将它们替换为Nothing. C#不支持可选值(至少到4.0).

Instead of MissingValue, replace them with Nothing. C# doesn''t support optional values (until 4.0 at least).

感谢帮助，但没有任何改变:(

Thanks for help, but nothing didn''t change anything :(

C#代码

C# code

public ADODB.Recordset ConvertToRecordset(string XMLDataset)
        {
            DataTable inTable;
            string FileName;
            FileName = "c:\\temp\\result" + DateTime.Now.Millisecond + ".xml";
            ADODB.Recordset result = new ADODB.Recordset();
             XmlTextWriter xwriter = new XmlTextWriter(FileName, System.Text.Encoding.Default);
            DataSet ds = new  DataSet();
            StringReader xmlSR = new StringReader(XMLDataset);
            ds.ReadXml(xmlSR);
            inTable = ds.Tables[0];
            result.CursorLocation = ADODB.CursorLocationEnum.adUseClient;

            ADODB.Fields resultFields = result.Fields;
            System.Data.DataColumnCollection inColumns = inTable.Columns;

            foreach (DataColumn inColumn in inColumns)
            {
                resultFields.Append(inColumn.ColumnName
               , TranslateType(inColumn.DataType)
               , inColumn.MaxLength
               , inColumn.AllowDBNull ? ADODB.FieldAttributeEnum.adFldIsNullable :
               ADODB.FieldAttributeEnum.adFldUnspecified
              , null);
            }

            result.Open(System.Reflection.Missing.Value
           , System.Reflection.Missing.Value
           , ADODB.CursorTypeEnum.adOpenStatic
           , ADODB.LockTypeEnum.adLockOptimistic, 0);
            
            foreach (DataRow dr in inTable.Rows)
            {
                result.AddNew(System.Reflection.Missing.Value,
                System.Reflection.Missing.Value);

                for (int columnIndex = 0; columnIndex < inColumns.Count; columnIndex++)
                {
                    resultFields[columnIndex].Value = dr[columnIndex];
                }
            }

            return result;
        }


        ADODB.DataTypeEnum TranslateType(Type columnType)
        {
            switch (columnType.UnderlyingSystemType.ToString())
            {
                case "System.Boolean":
                    return ADODB.DataTypeEnum.adBoolean;

                case "System.Byte":
                    return ADODB.DataTypeEnum.adUnsignedTinyInt;

                case "System.Char":
                    return ADODB.DataTypeEnum.adChar;

                case "System.DateTime":
                    return ADODB.DataTypeEnum.adDate;

                case "System.Decimal":
                    return ADODB.DataTypeEnum.adCurrency;

                case "System.Double":
                    return ADODB.DataTypeEnum.adDouble;

                case "System.Int16":
                    return ADODB.DataTypeEnum.adSmallInt;

                case "System.Int32":
                    return ADODB.DataTypeEnum.adInteger;

                case "System.Int64":
                    return ADODB.DataTypeEnum.adBigInt;

                case "System.SByte":
                    return ADODB.DataTypeEnum.adTinyInt;

                case "System.Single":
                    return ADODB.DataTypeEnum.adSingle;

                case "System.UInt16":
                    return ADODB.DataTypeEnum.adUnsignedSmallInt;

                case "System.UInt32":
                    return ADODB.DataTypeEnum.adUnsignedInt;

                case "System.UInt64":
                    return ADODB.DataTypeEnum.adUnsignedBigInt;

                case "System.String":
                default:
                    return ADODB.DataTypeEnum.adVarChar;
            }
        }

vb.net代码

vb.net code

Public Function ConvertToRecordset(ByVal XMLDataset As String) As ADODB.Recordset

       Dim FileName As String = ""
       ConvertToRecordset = New ADODB.Recordset
       FileName = "c:\temp\result" & Now.TimeOfDay().Milliseconds & ".xml"
       Dim inTable As New DataTable
       Dim xwriter As New XmlTextWriter(FileName, System.Text.Encoding.Default)
       Dim ds As New DataSet
       Dim xmlSR As StringReader = New StringReader(XMLDataset)
       Dim result As ADODB.Recordset = New ADODB.Recordset
       ds.ReadXml(xmlSR)
       inTable = ds.Tables(0)
       result.CursorLocation = ADODB.CursorLocationEnum.adUseClient
       Dim resultFields As ADODB.Fields = ConvertToRecordset.Fields
       Dim inColumns As DataColumnCollection = inTable.Columns
       For Each inColumn As DataColumn In inColumns
           On Error Resume Next

           resultFields.Append(inColumn.ColumnName, TranslateType(inColumn.DataType.ToString), inColumn.MaxLength, _
                                 IIf(inColumn.AllowDBNull, ADODB.FieldAttributeEnum.adFldIsNullable, ADODB.FieldAttributeEnum.adFldUnspecified), Null)
           ''resultFields.Append("test", ADODB.DataTypeEnum.adVarChar, -1, ADODB.FieldAttributeEnum.adFldUnspecified, Null)
       Next
       result.Open(Nothing, Nothing, ADODB.CursorTypeEnum.adOpenStatic, _
                               ADODB.LockTypeEnum.adLockOptimistic, 0)

       For Each dr As DataRow In inTable.Rows
           result.AddNew(System.Reflection.Missing.Value, System.Reflection.Missing.Value)
           For columnIndex As Integer = 0 To inColumns.Count
               resultFields(columnIndex).Value = dr(columnIndex)
           Next
       Next
       ''ConvertToRecordset.Open()
       Return result
   End Function

   Private Function TranslateType(ByVal dtype As String) As String
       Select Case (dtype)
           Case "System.Int32"
               Return "int"
           Case "System.DateTime"
               Return "dateTime"
       End Select
   End Function

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